Manure for Mangold Wurzel. 401 



experiments which show equally clearly that neither of these 

 manures singly will ensure a good crop of mangold. 



But in case these applications had been made in too small 

 quantities, I tried a second series with larger quantities applied 

 singly, and embracing a comparison with dung alone, with the 

 following results : — 



tons, cwt 



40 cubic yards of dung produced . . . . 21 3 



Ts cwt. of Peruvian guano 17 17 



12 cwt. of superphosphate 14 19 



12 cwt. of nitrophosphate 15 6 



The best of these is nearly a third short of the best experiment, 

 and the worst is more than one-half deficient. 



The next series is a mixture of all the manures in various pro- 

 portions, salt however being an additional constituent of each : — 



1. 



20 cubic yards of dung <. 



1 cwt. of Peruvian guano I tons. cwt. 



1 cwt. of superpliosphate | produced 25 10 



1 cwt. of nitrophosphate I 



2 cwt. of common salt ) 



2. 



2 cwt. of Peruvian guano \ 



2 cwt, of superphosphate I ^0 P 



2 cwt. of nitrophosj)liatc I " ~ 



2 cwt. of common salt j 



3. 



11 cwt. of Peruvian guano \ 



1!^ cwt. of suix'r])hosphate I 1Q n 



1 3 cwt. of nitrophosphate j " 



1^ cwt. of salt j 



In each of these cases the proportion of salt seems to have been 

 too low, as, by running the eye down the annexed general Table 

 of the experiments, it will clearly be seen that in every instance 

 where salt forms an ingredient of the manure the produce is in- 

 creased. 



'^l^liis brings me to the last of tlic series, though the first in the 

 Taljlc, which, taken with the elTcct of salt in all the other cases 

 where it was ap|)lie(l, clearly shows that for my soil and locality 

 SALT should form a main ingredient in any mixed manure for the 

 mangold crop. Thus — 



tons. cwt. 



20 cubic yards of dung, and 4 cwt. of Peruvian griano, gave ..23 16 

 While the same manures, with the addition of 5 cwt. of salt, gave 30 12 



The additional G tons 16 cwt. were thus obtained at the moderate 

 cost of 7.V. tu/., the price of 5 cwt. of salt. 



The annexed 'I'able shows the details of the whole series of 

 experiments, with the cost of the manure and the produce of the 



